CLN: Make the null_value argument explicit by name when calling _series_unary_op()
CLN: Make the null_value argument explicit by name when calling _series_unary_op()

micahcochran/geopandas,perrygeo/geopandas,maxalbert/geopandas,ozak/geopandas,kwinkunks/geopandas,geopandas/geopandas,koldunovn/geopandas,jdmcbr/geopandas,jdmcbr/geopandas,micahcochran/geopandas,geopandas/geopandas,ozak/geopandas,jorisvandenbossche/geopandas,IamJeffG/geopandas,jorisvandenbossche/geopandas,jorisvandenbossche/geopandas,geopandas/geopandas,scw/geopandas,urschrei/geopandas,snario/geopandas